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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112b66cb2d6cc4fe4e6ee8cfbb40dde2e8c5c30cf7f5791696b6a301dbe0c3b3' 
  AND token = '4rbdB0BfqlQ+qI24V1/1Safr/r7LYDi67BL1MZHU830=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}